Rewrite ts to use a list of lists and change its API.

We want to get rid of maps because they're a bit too new for some
distributions. Replacing the arrays with lists is not necessary and
arguably not even the right move -- they're about twice as costly RAM
wise and the CPU cost for accesses are O(n). This cleans up the
implementation though so let's keep it as a reference implementation.

Changes to ht include poping potential placeholders in parent layer
before adding and swapping IR -> RI all over, for consistency.

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